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https://www.gauss-friends.org/2018/12/07/de-gauss-telegraph-kleine-reflexion-des-chinesischen-schnupperkurses-am-01-12-2018-en-gauss-telegraph-a-small-reflection-of-the-chinese-trial-lesson-on-01-12-2018/
Gauss-Telegraph: A small reflection of the Chinese trial lesson on 01.12.2018